Sal Paradise
Hooligan
I have an old bike (1981 GS250) with 5k miles which has been a totally excellent runner. Bike starts up and idles perfect always. Low end carb performance feels good.
You start out and the bike runs awesome,pulls hard for a 250. But warm up and get up to 55 mph and it starts to buck and hesitate.Slow down ( to 35) and she smooths out.I rebuilt and adjusted the carbs 10 times. Upsized the main jets. No effect
I suspected that the float valve needles might be worn out because the bowls were really full. But raising and lowering the float leavels has no effect. carbs are shiny clean inside. I put an in line filter in and its clear. .Plugs look great. No smoke. Tested for intake leaks by spraying with wd 40 on the boots. - negative. Needles and tubes look good. Diaphragms look good. Synched carbs last night.
At 60 at WOT its like someone is turning the key off and on.Back off the throttle and it smooths out.
Bike overal feels like its got even less power than usual.
Any ideas what else to check?
You start out and the bike runs awesome,pulls hard for a 250. But warm up and get up to 55 mph and it starts to buck and hesitate.Slow down ( to 35) and she smooths out.I rebuilt and adjusted the carbs 10 times. Upsized the main jets. No effect
I suspected that the float valve needles might be worn out because the bowls were really full. But raising and lowering the float leavels has no effect. carbs are shiny clean inside. I put an in line filter in and its clear. .Plugs look great. No smoke. Tested for intake leaks by spraying with wd 40 on the boots. - negative. Needles and tubes look good. Diaphragms look good. Synched carbs last night.
At 60 at WOT its like someone is turning the key off and on.Back off the throttle and it smooths out.
Bike overal feels like its got even less power than usual.
Any ideas what else to check?